Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for

Details Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for

1997-07-23

2000-09-19

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521137, 521155, 521170, 521172, 521174, C08J 914

Patent

active

061213373

ABSTRACT:
An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e.g., HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e.g., organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value. The present invention further relates to compositions comprising a blowing agent and an active hydrogen-containing compound, commonly referred to in the art as B-side compositions or blends, and using such compositions for producing polyurethane and polyisocyanurate foams in which the blowing agent comprises a major proportion of 1,1,2,2-tetrafluoroethane (HFC-134).

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